1
1
How many grams of water are produced
when 22 g of propane burn?
A)160 g
B) 72 g
C) 36 g
D) 80 g
E) 144 g
2
Solution to “How much …?”
Need balanced reaction equation!
Convert given quantities (e.g. mass) to moles,
why?
Because molecules react as molecules and the
number of molecules is key.
Set ratio of stoichiometric coefficients equal to
ratio of amounts given and needed to find.
Solve for the unknown amount in moles.
Convert to units requested.

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